POWER OF ATTORNEY for Executing Forms 3, 4 and 5
        KNOW ALL MEN BY THESE PRESENTS, that the 
undersigned hereby constitutes and appoints each of Darrell Smith, Edward J. 
Richardson, or David M. Koeninger, signing 
singly, his/her true and lawful attorney-in-fact to:
        (1)        execute for and on behalf of the undersigned 
Forms 3, 4 and 5 in accordance with Section 16(a) of the 
Securities Exchange Act of 1934 and the rules thereunder, 
with respect to the undersigned's beneficial ownership of 
securities of Radiation Therapy Services, Inc. (the "Company");
        (2)        do and perform any and all acts for and on 
behalf of the undersigned which may be necessary or 
desirable to complete the execution of any such Form 3, 4 or 
5 and the timely filing of such form with the United States 
Securities and Exchange Commission and any other 
authority; and
        (3)        take any other action of any type whatsoever 
in connection with the foregoing which, in the opinion of 
such attorney-in-fact, may be of benefit to, in the best interest 
of, or legally required by, the undersigned, it being 
understood that the documents executed by such 
attorney-in-fact on behalf of the undersigned pursuant to this 
Power of Attorney shall be in such form and shall contain 
such terms and conditions as such attorney-in-fact may 
approve in his/her discretion.
        The undersigned hereby grants to each such 
attorney-in-fact full power and authority to do and perform 
all and every act and thing whatsoever requisite, necessary 
and proper to be done in the exercise of any of the rights and 
powers herein granted, as fully to all intents and purposes as 
such attorney-in-fact might or could do if personally present, 
with full power of substitution or revocation, hereby ratifying 
and confirming all that such attorney-in-fact, or his/her 
substitute or substitutes, shall lawfully do or cause to be done 
by virtue of this power of attorney and the rights and powers 
herein granted.  The undersigned acknowledges that the 
foregoing attorneys-in-fact, in serving in such capacity at the 
request of the undersigned, are not assuming any of the 
undersigned's responsibilities to comply with Section 16 of 
the Securities Exchange Act of 1934.
        This Power of Attorney shall remain in full force and 
effect until the undersigned is no longer required to file 
Forms 3, 4 and 5 with respect to the undersigned's holdings 
of and transactions in securities issued by the Company, 
unless earlier revoked by the undersigned in a signed writing 
delivered to the foregoing attorneys-in-fact.
        IN WITNESS WHEREOF, the undersigned has 
caused this Power of Attorney to be executed as of this 17th  
day of June, 2004.
                                ___/s/ Howard Sheridan___________________
                                Howard Sheridan
RADIATION THERAPY SERVICES INC 4
